Coupling Degree Analysis And Layout Optimization For Vehicle-mounted Antenna System

Owing to the rapid development of science and technology,more and more electronic information equipments are integrated on the same platform.Since the electronic information equipments working on platforms such as aircraft,ship and vehicle are limited in a small space,their performance may be greatly decreased due to the coupling effect between them.Therefore,how to ensure the electromagnetic compatibility between these electronic information equipments,and how to improve their work performances have become the vital research problems.This study is accomplished based on the scientific research project called "EMC simulation and analysis of XX multi-function radio frequency sensors".On the basis of the electromagnetic field theory and computational electromagnetics theory,the electromagnetic compatibility between same type vehicle-mounted antennas is simulated and analyzed by using electromagnetic simulation software.VHF/UHF sleeve antenna and circular polarization patch antenna are modeled and analyzed.The effect of different platforms and different ground materials on the distortions of the antenna radiation pattern are studied,and the coupling degrees between the same type antennas are highly analyzed.Moreover,the minimum distance between the same type antennas is given with the requirement that the coupling degree is less than or equal to-50 d B.At last,vehicle-mounted antenna layout and its optimization are accomplished under the consideration about antenna position,azimuth and distance by the use of equivalent source method of CST software.